/*
 * $Id: $
 * 
 * Copyright (c) 2001-2008 Accentrix Company Limited. All Rights Reserved.
 * 
 * Accentrix Company Limited. ("Accentrix") retains copyright on all text, source
 * and binary code contained in this software and documentation. Accentrix grants
 * Licensee a limited license to use this software, provided that this copyright
 * notice and license appear on all copies of the software. The software source
 * code is provided for reference purposes only and may not be copied, modified 
 * or distributed.
 * 
 * THIS SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS," WITHOUT ANY WARRANTY OF
 * ANY KIND UNLESS A SEPARATE WARRANTIES IS PURCHASED FROM ACCENTRIX AND REMAINS
 * VALID.  ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. ACCENTRIX SHALL NOT BE LIABLE
 * FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING OR MODIFYING THE
 * SOFTWARE OR ITS DERIVATIVES.
 * 
 * IN NO EVENT WILL ACCENTRIX BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE
 * USE OF OR INABILITY TO USE SOFTWARE, EVEN IF ACCENTRIX HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */
package com.snowleopard.common.security;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springside.modules.utils.spring.SpringContextHolder;

import com.snowleopard.findpeople.dao.account.UserDao;
import com.snowleopard.findpeople.entity.account.User;


/**
 * Get the user who login findpeople system successfully.
 * 
 * @author LiuJian
 * 
 */
public class CurrentUser {

    private final static Logger log = LoggerFactory.getLogger(CurrentUser.class);

    public static User get() {
        String loginId = getName();
        if (StringUtils.isBlank(loginId)) {
            return null;
        }

        UserDao userProfileDao = SpringContextHolder.getBean(UserDao.class);
        User user = userProfileDao.findUniqueBy("loginId", loginId);

        log.info("CurrentUser is {}", user);
        return user;
    }

    private static final ThreadLocal<String> currentUser = new ThreadLocal<String>();

    public static void setCurrentUser(String username) {
        currentUser.set(username);
    }

    public static void removeCurrentUser() {
        currentUser.remove();
    }

    public static String getName() {

        String username = currentUser.get();
        if (username != null) {
            return username;
        }

        SecurityContext ctx = SecurityContextHolder.getContext();
        if (ctx == null) {
            log.error("SecurityContext is null");
            return null;
        }

        Authentication authentication = ctx.getAuthentication();
        if (authentication == null) {
            log.error("Authentication is null");
            return null;
        }

        return authentication.getName();
    }
}
